植物生态学报 ›› 2014, Vol. 38 ›› Issue (8): 878-887.DOI: 10.3724/SP.J.1258.2014.00082
乔丽青1,2, 田大栓2, 万宏伟2, 宝音陶格涛1,*(), 潘庆民2,*()
收稿日期:
2014-04-15
接受日期:
2014-05-22
出版日期:
2014-04-15
发布日期:
2014-08-18
通讯作者:
宝音陶格涛,潘庆民
作者简介:
bytgtnm@126.com基金资助:
QIAO Li-Qing1,2, TIAN Da-Shuan2, WAN Hong-Wei2, BAOYIN Taogetao1,*(), PAN Qing-Min2,*()
Received:
2014-04-15
Accepted:
2014-05-22
Online:
2014-04-15
Published:
2014-08-18
Contact:
BAOYIN Taogetao,PAN Qing-Min
摘要:
放牧是内蒙古草原最主要的利用方式, 而草原植物在不同放牧压力下的生长和繁殖策略是它们与有蹄类动物长期协同进化的结果。为了了解瓣蕊唐松草(Thalictrum petaloideum)的生长和繁殖策略如何响应载畜率的变化, 作者依托中国科学院内蒙古草原站的大型放牧实验平台, 从种群、个体和器官三个组织水平上研究了该物种对放牧强度的响应。结果表明: 1)在种群水平上, 随着载畜率的增加, 瓣蕊唐松草减少了生殖株丛数或不进行有性生殖生长。该实验条件下, 载畜率每hm 2 7.5只羊(夏季)是瓣蕊唐松草不再进行生殖生长的阈值; 2)在个体水平上, 随着载畜率的增加, 瓣蕊唐松草降低了株高和个体生物量, 减少了生殖枝、花朵和种子等生殖器官的数量。随着载畜率的增加, 瓣蕊唐松草生殖分配的调节从依赖于植株个体大小向不依赖于植株个体大小转变。3)在器官水平上, 随着载畜率的增加, 瓣蕊唐松草减少了生殖枝的花朵负荷, 提高了单粒质量。籽粒数量和籽粒质量之间的权衡是瓣蕊唐松草应对放牧干扰的重要机制。
乔丽青, 田大栓, 万宏伟, 宝音陶格涛, 潘庆民. 不同载畜率下瓣蕊唐松草的生长和繁殖对策. 植物生态学报, 2014, 38(8): 878-887. DOI: 10.3724/SP.J.1258.2014.00082
QIAO Li-Qing, TIAN Da-Shuan, WAN Hong-Wei, BAOYIN Taogetao, PAN Qing-Min. Growth and reproductive strategies of Thalictrum petaloideum under different stocking rates. Chinese Journal of Plant Ecology, 2014, 38(8): 878-887. DOI: 10.3724/SP.J.1258.2014.00082
图1 不同载畜率下瓣蕊唐松草的密度和地上生物量(平均值±标准误差, n = 5)。不同的小写字母表示在0.05水平上差异显著。
Fig. 1 Density and aboveground biomass of Thalictrum petaloideum population under different stocking rates (mean ± SE, n = 5). Different lowercase letters indicate significant differences (p < 0.05).
图2 不同载畜率下瓣蕊唐松草的株高(A)与个体生物量(B) (平均值±标准误差, n = 50)。不同的小写字母表示在0.05水平上差异显著。
Fig. 2 Plant height (A) and biomass per plant (B) of Thalictrum petaloideum under different stocking rates (mean ± SE, n = 50). Different lowercase letters indicate significant differences (p < 0.05).
图3 不同载畜率下瓣蕊唐松草个体的生殖枝数(A)与花朵数(B) (平均值±标准误差, n = 50)。不同的小写字母表示在0.05水平上差异显著。
Fig. 3 Numbers of reproductive branches (A) and flowers (B) of Thalictrum petaloideum at individual level under different stocking rates (mean ± SE, n = 50). Different lowercase letters indicate significant differences (p < 0.05).
图4 不同载畜率下个体水平种子数(A)和单株种子产量(B) (平均值±标准误差, n = 50)。不同的小写字母表示在0.05水平上差异显著。
Fig. 4 Number of seeds per plant (A) and seed yield per plant (B) of Thalictrum petaloideum under different stocking rates (mean ± SE, n = 50). Different lowercase letters indicate significant differences (p < 0.05).
图5 不同载畜率下单枝花朵数(A)与单粒质量(B) (平均值±标准误差, n = 50)。不同的小写字母表示在0.05水平上差异显著。
Fig. 5 Number of flowers per branch (A) and grain mass (B) of Thalictrum petaloideum under different stocking rates (mean ± SE, n = 50). Different lowercase letters indicate significant differences (p < 0.05).
图6 不同载畜率下瓣蕊唐松草的生物量生殖分配(平均值±标准误差, n = 50)。不同的小写字母表示在0.05水平上差异 显著。
Fig. 6 Reproductive biomass allocation of Thalictrum petaloideum under different stocking rates (mean ± SE, n = 50). Different lowercase letters indicate significant differences (p < 0.05).
载畜率 Stocking rate (sheep·hm-2) | ||||
---|---|---|---|---|
0 (对照 Control) | 1.5 | 3.0 | 6.0 | |
斜率 Slope | 0.863a | 1.200b | - | - |
R2 | 0.569 | 0.107 | - | - |
p | < 0.000 1 | 0.022 | 0.688 | 0.108 |
截距 Intercept | 0.075 93 | -0.413 96 | - | - |
重复数 Number of replications | 50 | 48 | 49 | 36 |
表1 不同载畜率下瓣蕊唐松草在个体水平上种子与非种子部分生殖分配计量关系的变化
Table 1 Changes in reproductive allometric relationships between seeds and non-seed parts at an individual level in Thalictrum petaloideum under different stocking rates
载畜率 Stocking rate (sheep·hm-2) | ||||
---|---|---|---|---|
0 (对照 Control) | 1.5 | 3.0 | 6.0 | |
斜率 Slope | 0.863a | 1.200b | - | - |
R2 | 0.569 | 0.107 | - | - |
p | < 0.000 1 | 0.022 | 0.688 | 0.108 |
截距 Intercept | 0.075 93 | -0.413 96 | - | - |
重复数 Number of replications | 50 | 48 | 49 | 36 |
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